/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     struct TreeNode *left;
 *     struct TreeNode *right;
 * };
 */


bool isSameTree(struct TreeNode* p, struct TreeNode* q){
    if(p == NULL && q == NULL) return true;
    if(p == NULL || q == NULL) return false;
    if(p->val - q ->val) return false;
    return isSameTree(p->left, q->left) && isSameTree(p->right, q->right);
}
